.TH std::isblank(std::locale) 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::isblank(std::locale) \- std::isblank(std::locale)

.SH Synopsis
   Defined in header <locale>
   template< class CharT >                       \fI(since C++11)\fP
   bool isblank( CharT ch, const locale& loc );

   Checks if the given character is classified as a blank character by the given
   locale's std::ctype facet.

.SH Parameters

   ch  - character
   loc - locale

.SH Return value

   Returns true if the character is classified as a blank character, false otherwise.

.SH Possible implementation

   template<class CharT>
   bool isblank(CharT ch, const std::locale& loc)
   {
       return std::use_facet<std::ctype<CharT>>(loc).is(std::ctype_base::blank, ch);
   }

.SH Example

   Demonstrates the use of isblank() with different locales (OS-specific).


// Run this code

 #include <iostream>
 #include <locale>

 void try_with(wchar_t c, const char* loc)
 {
     std::wcout << "isblank('" << c << "', locale(\\"" << loc << "\\")) returned "
                << std::boolalpha
                << std::isblank(c, std::locale(loc)) << '\\n';
 }

 int main()
 {
     const wchar_t IDEO_SPACE = L'\\u3000'; // Unicode character 'IDEOGRAPHIC SPACE'
     try_with(IDEO_SPACE, "C");
     try_with(IDEO_SPACE, "en_US.UTF-8");
 }

.SH Possible output:

 isblank(' ', locale("C")) returned false
 isblank(' ', locale("en_US.UTF-8")) returned true

.SH See also

   isblank  checks if a character is a blank character
   \fI(C++11)\fP  \fI(function)\fP
   iswblank checks if a wide character is a blank character
   \fI(C++11)\fP  \fI(function)\fP
